このチュートリアルに従って、 acts_as_commentable_with_threading
gemでスレッド化されたコメントを実装しています。ただし、gem が Comment モデルをセットアップする方法に起因すると思われる大量割り当てエラーが発生しているようです。これを変更する必要があるかどうかはわかりません (ライブラリの本来の意図のため)。
エラー出力
Can't mass-assign protected attributes: commentable, body, user_id
app/models/comment.rb:20:in `new'
app/models/comment.rb:20:in `build_from'
app/controllers/posts_controller.rb:21:in `show'
posts_controller.rb
def show
@post = Post.find(params[:id])
@comments = @post.comment_threads.order('created_at desc')
@new_comment = Comment.build_from(@post, current_user.id, "")
end
コメント_コントローラー.rb
class CommentsController < ApplicationController
def create
@comment_hash = params[:comment]
@obj = @comment_hash[:commentable_type].constantize.find(@comment_hash[:commentable_id])
@comment = Comment.build_from(@obj, current_user.id, @comment_hash[:body])
if @comment.save
render :partial => "comments/comment", :locals => { :comment => @comment }, :layout => false, :status => :created
else
flash.now[:error] = 'Comment was not submitted.'
end
end
end
コメント.rb
class Comment < ActiveRecord::Base
acts_as_nested_set :scope => [:commentable_id, :commentable_type]
validates :body, :presence => true
validates :user, :presence => true
# NOTE: install the acts_as_votable plugin if you
# want user to vote on the quality of comments.
#acts_as_votable
belongs_to :commentable, :polymorphic => true
# NOTE: Comments belong to a user
belongs_to :user
# Helper class method that allows you to build a comment
# by passing a commentable object, a user_id, and comment text
# example in readme
def self.build_from(obj, user_id, comment)
new \
:commentable => obj,
:body => comment,
:user_id => user_id
end
#helper method to check if a comment has children
def has_children?
self.children.any?
end
# Helper class method to lookup all comments assigned
# to all commentable types for a given user.
scope :find_comments_by_user, lambda { |user|
where(:user_id => user.id).order('created_at DESC')
}
# Helper class method to look up all comments for
# commentable class name and commentable id.
scope :find_comments_for_commentable, lambda { |commentable_str, commentable_id|
where(:commentable_type => commentable_str.to_s, :commentable_id => commentable_id).order('created_at DESC')
}
# Helper class method to look up a commentable object
# given the commentable class name and id
def self.find_commentable(commentable_str, commentable_id)
commentable_str.constantize.find(commentable_id)
end
end